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Android projemde bir sorun yaşıyorum. Veritabanından veri alıp bu listeyi bir araya getirdiğim bir listeye sahibim. Bir liste için bir tane diğeri de hariç tutmak için 2 tane butonum var. Fakat liste dolduğunda ve sonuna kadar kaydırmaya çalıştığımda veya ListAdapter sınıfımdaki düğmeler için nullpointerexception'ı aldığımda, ne olduğunu ve nasıl çözüleceğini anlayamıyorum. Düğmeler, listeyi kaydırmazsanız normal olarak çalışır. İngilizcem için üzgünüm.Null Pointer liste görünümüne geçmek için
Benim ListFragment
public class ListFragment extends Fragment implements View.OnClickListener{
private Button btNovaBiometria;
private ListView lvBiometria;
private SQLiteDatabase database;
private BancoDeDados bancoDeDados;
private Context contexto;
private View viewPai;
private ListAdapter listAdapter;
public static ListFragment listFragment;
public static final String LIST_VIEW_TAG = "LIST_VIEW_TAG";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
viewPai = inflater.inflate(R.layout.fragment_list, container, false);
((PrincipalActivity) getActivity()).getSupportActionBar().setSubtitle("Lista de biometrias");
contexto = getActivity().getApplicationContext();
listFragment = this;
bancoDeDados = new BancoDeDados(contexto);
database = bancoDeDados.getWritableDatabase();
btNovaBiometria = (Button) viewPai.findViewById(R.id.bt_nova_biometria);
btNovaBiometria.setOnClickListener(this);
lvBiometria = (ListView) viewPai.findViewById(R.id.lv_biometria);
ArrayList<Biometria> biometrias = buscarTodasBiometrias();
listAdapter = new ListAdapter(contexto,biometrias, listFragment);
lvBiometria.setAdapter(listAdapter);
return viewPai;
}
public void onClick(View view){
if (view == btNovaBiometria){
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
getFragmentManager().beginTransaction().addToBackStack("Lista de biometrias").replace(R.id.principal, new BiometriaFragment(), ListFragment.LIST_VIEW_TAG).commit();
}
}
public ArrayList<Biometria> buscarTodasBiometrias(){
ArrayList<Biometria> biometrias = new ArrayList<Biometria>();
String sql = "SELECT _id, Tanque_id, qtd_total_animais, peso_liquido_total, media, data FROM Biometria; ";
Cursor cursor = database.rawQuery(sql, null);
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
Biometria biometria = new Biometria();
biometria.set_id(cursor.getLong(0));
biometria.setTanque_id(cursor.getInt(1));
biometria.setAnimaisTotal(cursor.getInt(2));
biometria.setPesoLiquidoTotal(cursor.getFloat(3));
biometria.setMedia(cursor.getFloat(4));
biometria.setData(cursor.getString(5));
biometrias.add(biometria);
}
cursor.close();
return biometrias;
}
}
Benim ListViewHolder:
public class ListViewHolder {
ImageButton btVisualizar;
TextView tvItem;
ImageButton btExcluir;
}
Benim ListAdapter:
public class ListAdapter extends BaseAdapter {
private Context contexto;
private ArrayList<Biometria> biometriaArrayList;
private SQLiteDatabase database;
private BancoDeDados bancoDeDados;
private ListFragment listFragment;
public ListAdapter(Context contexto, ArrayList<Biometria> biometriaArrayList, ListFragment listFragment) {
this.contexto = contexto;
this.biometriaArrayList = biometriaArrayList;
this.listFragment=listFragment;
}
@Override
public int getCount() {
return biometriaArrayList.size();
}
@Override
public Biometria getItem(int position) {
return biometriaArrayList.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, final View convertView, ViewGroup parent) {
final View row;
bancoDeDados = new BancoDeDados(contexto);
database = bancoDeDados.getWritableDatabase();
final ListViewHolder listViewHolder;
if(convertView == null){
LayoutInflater layoutInflater = (LayoutInflater) contexto.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.listview_item,parent,false);
listViewHolder = new ListViewHolder();
listViewHolder.btExcluir = (ImageButton) row.findViewById(R.id.bt_excluir);
listViewHolder.tvItem = (TextView) row.findViewById(R.id.tv_Item);
listViewHolder.btVisualizar = (ImageButton) row.findViewById(R.id.bt_visualizar);
}else {
row=convertView;
listViewHolder = (ListViewHolder) row.getTag();
}
final Biometria biometria = biometriaArrayList.get(position);
/**the nullpointer occurs exactly on that line to scroll the list view**/ listViewHolder.btExcluir.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(listFragment.getActivity());
builder.setTitle("Excluir");
builder.setMessage("Tem certeza que deseja excluir este item?")
.setPositiveButton("Sim", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
for (Biometria biometrias : biometriaArrayList) {
if (biometrias.get_id() == biometria.get_id()) {
try {
listFragment.getFragmentManager().beginTransaction().replace(R.id.principal, new ListFragment()).commit();
String sql = "DELETE FROM Biometria WHERE _id='" + biometria.get_id() + "'";
DatabaseUtils.longForQuery(database, sql, null);
} catch (SQLException ex) {
}
break;
}
}
Toast.makeText(contexto, "Voce excluiu o item", Toast.LENGTH_LONG).show();
return;
}
})
.setNegativeButton("Não", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
});
listViewHolder.btVisualizar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bundle bundle = new Bundle();
bundle.putSerializable("Biometria", biometria);
BiometriaResumoFragment fragobj= new BiometriaResumoFragment();
fragobj.setArguments(bundle);
listFragment.getFragmentManager().beginTransaction().addToBackStack("Lista de biometrias").replace(R.id.principal, fragobj).commit();
Toast.makeText(contexto, "Voce Visualizou o item", Toast.LENGTH_LONG).show();
}
});
listViewHolder.tvItem.setText(String.valueOf(getItem(position)));
return row;
}
}
Hata Günlüğü:
03-30 16:03:00.821 21565-21565/br.com.agrtec.www.biometriamodulo E/AndroidRuntime: FATAL EXCEPTION: main
Process: br.com.agrtec.www.biometriamodulo, PID: 21565
java.lang.NullPointerException
at br.com.agrtec.www.biometriamodulo.ListAdapter.getView(ListAdapter.java:78)
at android.widget.AbsListView.obtainView(AbsListView.java:2255)
at android.widget.ListView.makeAndAddView(ListView.java:1790)
at android.widget.ListView.fillUp(ListView.java:725)
at android.widget.ListView.fillGap(ListView.java:664)
at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5143)
at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3243)
at android.widget.AbsListView.onTouchMove(AbsListView.java:3587)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3431)
at android.view.View.dispatchTouchEvent(View.java:7706)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
at android.view.View.dispatchPointerEvent(View.java:7886)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3826)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3442)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3411)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3518)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3419)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3575)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3442)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3411)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3419)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5532)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5512)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5483)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5612)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Nativ
hata günlüğü ekleyin ... –
Üzgünüm, zaten güncellenmişti. –
Ayrıca 'listview_item' ekleyebilirsiniz? –